I have a simple app that accepts dropping files from Finder.
I want to support 3 different dragging types:
move
copy
link (make alias)
When pressing Alt+Cmd while dragging, Finder usually creates an alias (link). However, in my app in draggingEntered: the flag NSDragOperationLink is not set in that case.
Below are the various flags for the different modifier key combinations:
move (no keys): Private, Delete, Copy, Generic, Link, Move, All_Obsolete, Every
copy (Alt) : Copy, All_Obsolete, Every
link (Alt+Cmd): Copy, Generic, All_Obsolete, Every
Note how in the last case the Link flag is not set. How could I tell in performDragOperation: that I need to create an alias?
Do I really have to check the modifier keys in the current event? I'd much rather have a clean solution via the source dragging operation mask...
Tested on 10.8.5 and 10.9.
You need to register first your dragged types in the code using
registerfordraggedtypes: api
Yes, I know it's a very old thread but it still comes up in search results.
For drag-and-drop operations that span applications you have to hold down Control to filter for the Link flag.
In the online documentation for NSDraggingInfo draggingSourceOperationMask there's a table showing how the modifier keys are handled but it's wrong (it seems to be describing how the Finder works). If you can dig up older documentation on the drag-and-drop API it shows a different filtering algorithm where Option filters for Copy, Command filters for Generic, and Control filters for Link. That's the filtering algorithm that the OS still applies to inter-application drag-and-drop.
Related
How do you export a NSDocument in one format into another NSDocument in another format?
I would like to implement the typical Export option in my document-based app. I'm not sure where I should put the format conversion code, and what is already provided by Cocoa.
All the writing options in NSDocument get a string parameter to specify the type of file that should be written. So in your dataOfType:error: or fileWrapperOfType:error: methods you should implement the conversion code for each file type you want to support.
To start your export operation you can use the method saveToURL:ofType:forSaveOperation:completionHandler: with the desired type and a save operation of NSSaveToOperation.
For more information on the methods you can override to support loading and saving document data take a look at this programming guide.
You can get the available types from the class method writableTypes or the instance method writableTypesForSaveOperation:, again with NSSaveToOperation.
The file types you want to support need to be declared in your Info.plist file.
If your NSDocument subclass supports in-place autosaving, and all writable types are also readable (as they should be), I would recommend to use the already provided type-conversion workflow, where the user should use "Duplicate" followed by "Save".
In this workflow, when the user "Duplicate" the document, it's written/copied to a temporary file (where autosaved files are saved) as an untitled document. When the user closes the document window, the app suggests her to save the document or delete it. Since the document has no permanent URL yet, an NSSavePanel will appear with an accessory view that lets the user to select the document type.
In this solution everything is already provided by Cocoa and you don't have to do anything to support a special "Export" functionality as the user can use "Duplicate" followed by "Save".
You only have to be able to save your document to all writable types from dataOfType:error: or in fileWrapperOfType:error: according to the typeName argument (as Sven said).
The advantage here is that the user has to choose the URL only when she closes the file (and chooses not to delete it) - and is compatible with the new workflow in document-based apps where the "save as" operation has been replaced by "duplicate" followed by "save".
Note that you also have to make sure that you can duplicate documents of non-writable documents (you can achieve that by copying the original file instead of using writeSafelyToURL:ofType:forSaveOperation:error:).
Does Xcode have a way to show the caller function of a method? I want to know all of the calling functions of a method in a class. A solution would be to find the method in the project, but sometimes different classes have methods with the same name - That could find us a method we're not looking for..
Many other IDEs have this capability, such as Visual C++ 2003/2005/2008,Eclipse ...
Can you do this in XCode?
Xcode 4.4 intrudced this functionality:
New Features in Xcode 4.4 (Scroll down to 'Find and Search Additions')
Move your cursor on top of the function you are interested in
Open the Assistant editor(⌃ +⌘+Enter)
On the top of the assistant editor, Select 'Callers'
You will see a list of all the function that's calling your function
Not the as effective as other IDEs, but does the job.
Yes. Set a breakpoint inside your method, then when it breaks, there are two spots to see a stack. First is in Xcode's "console" area (usually the bottom middle), there is a top-bar which may not immediately appear to be navigable, but it is a select-style UI control which has the entire stack in it. Selecting a different level shows you that scope's variables, etc. and pops your editor to that exact file (where you can mouse-over variables to see their in-memory real-time values). Second is in the left-hand area (where you normally browse files). There is another tab there (besides the file browser) for exactly this purpose. There is a slider at the bottom which controls how many "steps" in the stack you see; clicking on one has a similar affect.
For simple refactoring such as method re-naming, you can use the contextual-menu when you right-click a selected method-name, and Xcode will replace all identical selectors in your project. However, this does not address what you mentioned about different classes having methods with the same signature. It does, however, give you a very nice interface for reviewing the changes in-context and easily accepting or rejecting them one at a time.
It might be noted, however, that changing method signatures often may be a sign of poor design, and particularly if you have to do it with methods which have the same signature on different classes (which are not "siblings" and therefore should both get the rename)
How can I change the order of the entries in the context menu?(e.g. for Directories) I need to know how Windows determines the order when showing that so I can control it. For example I want to place my custom action at the end of the context menu list
Thank in advance!
My Google-fu led me to this:
So the sorting is based on the following elements in decision order:
Key priority (eg, txtfile, *, AFSO)
Registry Enumeration order of shellex\contextmenuhandlers with a special case for static verbs always being first
IContextMenu Implementation order
So if there is any contention for position, there is no consistent way for an extension to guarantee their relative position within the menu.
Obviously you can't do anything about phase 1. Phase 3 only applies to the verbs implemented in your handler. That leaves phase 2. The only thing you can do is name your entry under ContextMenuHandlers such that it would be enumerated first, but nothing's stopping someone else from doing the same thing.
This is for Windows 7, maybe same for newer versions. It was inspired by the other answers, all is affecting the order.
I'm explaining entries for "*" (all files), but the same goes for special extensions.
I take no responsibility for any changes made in registry!
There are three sections in the context menu, as it says in How to Change the Order of Options in Context Menu (from answer by #Anonymouse)
They call them:
2 - Default menu position (at the top).
1 - Send to, copy to folder and move to folder menu part (in the middle).
0 - Rename menu part (at the bottom).
Within these sections the position is decided by the rules in answer by #Luke
The easiest way to change the order within the "section" is to change the name of the registry key under HKCR-*-shell or HKCR-*-shellex. All under subkey shell will be before them under shellex. Keys that have the CLSID as the key name will be as last entry since they are last in the used order.
As an example, I was following a sample from MSDN to build a Context Menu Handler
EDIT 2021-04-14:
The MSDN link is no longer valid, it redirects to a "Browse code samples" page. You can search there for Context menu sample, but the one I followed seems to have been removed.
The closest to the old one I followed is perhaps this
The one I followed is using the CLSID as the name for the key under shellex, and a "friendly name" as default value. It was placed at the bottom of "section" 2 (top section). I changed the key name to something like Asample and changed the default value to be the CLSID instead. Now it was directly after entries under shell.
There are some more ways of changing the order.
For keys under shell you can add the value Position with string data Top or Bottom. Not possible to decide in what "section".
For keys under shellex the value Position has no effect. Instead it's possible to decide in what "section" the entry will be using flags, described in the link above.
Use the CLSID for the shellext you want to move. It's like
{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}. Get it either from the key name or the default value, it depends on how the entry is done.
Find the entry under HKCR-CLSID, the key has the name of the CLSID.
Add a value with name flags and data DWORD with the "section" number described above under the found CLSID.
This did it for me... Steps 4 through 7 - setting the "flags"
http://techoqueries.blogspot.de/2012/08/how-to-change-order-of-options-in.html
This Q&A shows a simple way to CREATE (not move) an item within the context menu. I managed to duplicate an existing item. Then I moved my item to a higher and more accessible position within the context menu, by renaming the key to start with something "aMyItem" or "0MyItem".
I've been trying to find a way to re-order things, it irritates me that the daily use options are pushed to the end, when obscure utilities you might use once in a blue moon are filling up the top of the list.
I found a lazy way to do this, using a little utility package called "Windows 10 Manager" Windows 10 Manager - it's a few quid, but it's a lot easier than registry hacking. It can't do everything, but it does let you add items into the top section at least - and also to suppress cheeky ones that installed themselves in there without asking.
As you can see, it's actually duplicated some entries rather than moving them, but never mind.
Is there a way to add an item that doesn't point to a file that exists on the file system to the "Open Recent" menu?
In an application not based on NSDocument, I can add an item to the "Open Recent" submenu with the following code:
[[NSDocumentController sharedDocumentController] noteNewRecentDocumentURL:[NSURL URLWithString:stringToFilePath]];
It works as documented, as long as the URL points to a file that exists on the file system.
If the url doesn't point to a file on the system, such as a web url, or a custom url scheme, nothing happens.
For example, this code has no effect, and produce no log during execution, even if my app handles the scheme used in the URL:
[[NSDocumentController sharedDocumentController] noteNewRecentDocumentURL:[NSURL URLWithString:#"http://www.stackoverflow.com"]];
Update: someone found (a long time ago) a way to tweak this menu to have it show files whether they exist or not: http://lists.apple.com/archives/cocoa-dev/2007/Apr/msg00651.html
I successfully managed to subclass NSDocumentController, but my override of the method - (NSArray *)recentDocumentURLs is never called.
It's not very surprising, as the doc says:
This method is not a good one to
override since the internals of
NSDocumentController do not generally
use it.
But the doc doesn't say what to use instead and the poster didn't give more detail. Any idea?
If there is no solution, on workaround would be to rewrite the entire menu from scratch.
If possible, I would prefer to avoid that, for all the stuff I get for free (like when you have two items with the same name, it displays the parent directory as well to help differentiate them).
It looks like you'll probably have to create your own menu and maintain your own separate list. This menu automatically excludes files that don't exist.
I believe this is also true of files on removable media that is absent (ie, if the media comes back, the I believe the file is once again available in the list if it hasn't been pushed off by more recent items).
I have a dialog that includes file selection and it has a "Browse..." button. But it seems like it would be a good idea to provide some kind of drop target so that the user can use his/her favorite file browser to select a file (or files) and drag it onto my application.
Is there any standard practice for what to use as a drop target?
Is it a file icon of some sort? what would that look like?
I tend to think that drop targets should be where the file "should land". That is, if I had a browse button and file path editbox, I'd make the path box the target. If I made a document editing application, I'd make the entire editing area the drop target (unless that would make an embedded object of course ... :-P who said these things are easy?)
So I'd say it depends on the application. But having a dedicated, separate target with no other purpose than to drop things on may not be the best solution, since it unneccessarily clutters the interface even for people who will never be interested in using the feature.
In Safari (on the Mac, at least), a file-chooser form element (Consisting of a "Choose..." button and a field showing the chosen file's name) is also a drag-and-drop target. (Contrast with Firefox, which treats the whole window as a drag-and-drop target, and will replace the current page with the dropped item.)
Other places, I've seen an inset box, sometimes with a centered, grayed-out "Drag items here" text which disappears if anything is dragged in.
As Ruddy said, I don't recall any standard icon for the drop idea. There is one for the no drop as shown in this image
(source: west-wind.com)
Otherwise I tend to like this kind of drop explanation; I find them pretty explicit.
Usually if a window accepts files for drag'n'drop - it just accepts them anywhere in the window.
If you have a list of files (listbox/view) or an just an text box that accepts a single file, those individual control windows could be the drop target rather than the entire window.
Normally there is no visual indication that a window accepts file drops. The only indication would be that you try it and you don't get the no-drop cursor when you drag across the window.
(Note: this is under MS Windows, other os window systems may have different standards)